TCP/IP advanced: Ports

You have a basic understanding of TCP/IP
( IP-address, subnet-mask, Gateway, DNS, DHCP,....),
but now it is time to look at an advanced issue, which has a
serious impact on network security,
especially when using TCP/IP to connect to the Internet: Ports.
Let's start by looking in the Control-Panel at "Internet
Options" :

Connection a single PC
to the Internet
is easy, it becomes more complex when
you connect a network of multiple PCs
via a single connection to the Internet.
In such cases, you will need a Proxy,
and you need to configure on the
tab: Connections the "Lan
Settings",where you need to define PORT
information.